Patches are what make a backpack a HEDi-Pack. Whether you’re buying them from us, finding them somewhere else, or making them yourself, the HEDi-Pack was designed to showcase your patches. Washington State University Helmet Patch 2. 5”H x 3. 375”W Don’t know where to start? Think of the moments, milestones, relationships, traditions, and journeys that shaped you—each and every one of them could be a patch you display proudly.